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Port 138

Port
Protocol
Service Name
Description
Source
138
TCP UDP
netbios-dgm
NETBIOS Datagram Service
IANA
138
TCP UDP
NetBIOSĀ NetBIOS Datagram Service,Official
wikipedia
138
 UDP
NETBIOS Datagram Service, Windows Datagram Service, Windows Network Neighborhood
Apple.com
138
TCP 
Chode
anti-trojan
138
 
Chode, Nimda
simovits.com
138
TCP UDP
netbios-dgm
NETBIOS Datagram Service
bekkoame

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A port is an application-specific or process-specific software construct serving as a communications endpoint in a computer's host operating system.

Service names and port numbers are used to distinguish between different services that run over transport protocols such as TCP, UDP, DCCP, and SCTP.

Port numbers are assigned in various ways, based on three ranges: System Ports (0-1023), User Ports (1024-49151), and the Dynamic and/or Private Ports (49152-65535);